Challenges called for them to paraglide over Iquique, Chile, subject themselves to a freezing water plunge in Norway and take part in Formula One Racing in Abu Dhabi.

On Sunday's two-hour finale, one of the final four will be eliminated early, leaving three teams in the sprint to be the first to the finish line, which this season takes them to Alaska. One team will go home with the $1 million prize.

The Hollywood Reporter has exclusive photos from the finale, which airs at 8 p.m. Sunday. Ahead of the big reveal, host PhilKeoghan shared his thoughts about the final four.

Married ER doctors TravisJasper, 43, and NicoleJasper, 39:

“Travis is really giving Nicole a hard time. I guess he has high expectations, and I think Nicole is struggling a little bit with that pressure. I think if they are going to win this race, they are really going to have to get back to what they were doing in the beginning which was taking time with each other, giving each other the time to be able to do what they do best, and not pointing out where they’re wrong.”

Dating duo JasonCase, 33, and AmyDiaz, 29:

“Jason and Amy are a powerhouse. What a nice relationship. They really respect each other. They’re both strong, they’re both smart and they are Boston-proud. They want to bring it home.”

Exes Tim Sweeney, 32, and Marie "Reebs" Mazzocchi, 29:

“I’m not sure that any of us thought that all this bickering and yelling and criticism and craziness would have Tim and Marie finishing in the final four. Really!? Marie is so hard on Tim. I don’t know how he takes it. I certainly would not be able to take the abuse.”

Cousins LeoTemory, 26, and JamalZadran, 26:

“I think at this point the other three teams just want to see the Afghanimals go away. They don’t want to see them win. Leo and Jamal are pretty strong, though. They’re determined to stick with it, and they’re certainly not lacking in confidence.”